The map_yp_alias function in functions/imap_general.php in SquirrelMail before 1.4.19-1 on Debian GNU/Linux, and possibly other operating systems and versions, allows remote attackers to execute arbitrary commands via shell metacharacters in a username string that is used by the ypmatch program. NOTE: this issue exists because of an incomplete fix for CVE-2009-1579.
CVSS Severity (version 2.0):
Impact Subscore: 6.4
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
Official Statement from Red Hat (05/26/2009)
Not vulnerable. This issue did not affect the versions of squirrelmail as shipped with Red Hat Enterprise Linux 3, 4, or 5.
Updates for squirrelmail released via RHSA-2009:1066 (https://rhn.redhat.com/errata/RHSA-2009-1066.html) fixed original flaw CVE-2009-1579 without introducing CVE-2009-1381.
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20090521 [SECURITY] [DSA 1802-2] New squirrelmail packages correct incomplete fix